Oct 14 2008:: A new subject ... maybe a new category.
In some ways, business rule languages represent the "soft underbelly" of the business rules approach. They can be arcane pseudo-languages reserved for highly trained specialists, which tends to defeat the original purpose of business rules and limit their value to business people.
Best practices for business rules.
Updated Sept 7 2008: created
First note that there really are no good definitions of business rule methodology available - the main link is to Wikipedia's definition of business rules, where they state simply "Business Rules Methodology is the process of capturing business rules in English, in real-time while empowering users to manage rules with a few simple steps". What are the simple steps that empowering users to manage rules ? And do they really have to be in English ?
Updated Sept 27 2008: more links
Most of the methodologies described in these business rule sites are waaay more than is needed for a simple 'semantic web rule' methodology. They are shooting for 99.99% completeness and accuracy in transaction process systems that may be driving multi-billion dollar business units. The goals of this enterprise are far more modest.